簡算①9/10+(2/7+1/10)②5/3-(5/13+2/3)③3/4-7/15-8/15+1/4 急 老師們快來呀!(跪拜) 只要有回答者,立刻把5分經驗值給你!

簡算①9/10+(2/7+1/10)②5/3-(5/13+2/3)③3/4-7/15-8/15+1/4 急 老師們快來呀!(跪拜) 只要有回答者,立刻把5分經驗值給你!

①9/10+(2/7+1/10)
=9/10+1/10+2/7=1+2/7=1又2/7
②5/3-(5/13+2/3)
=5/3-2/3-5/13=1-5/13=8/13
③3/4-7/15-8/15+1/4
=3/4+1/4-(7/15+8/15)
=1-1=0